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package core
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
"gopkg.in/fatih/set.v0"
)
var txplogger = logger.NewLogger("TXP")
const txPoolQueueSize = 50
type TxPoolHook chan *types.Transaction
type TxMsg struct {
Tx *types.Transaction
}
const (
minGasPrice = 1000000
)
type TxProcessor interface {
ProcessTransaction(tx *types.Transaction)
}
// The tx pool a thread safe transaction pool handler. In order to
// guarantee a non blocking pool we use a queue channel which can be
// independently read without needing access to the actual pool.
type TxPool struct {
// Queueing channel for reading and writing incoming
// transactions to
queueChan chan *types.Transaction
// Quiting channel
quit chan bool
// The actual pool
//pool *list.List
pool *set.Set
SecondaryProcessor TxProcessor
subscribers []chan TxMsg
stateQuery StateQuery
eventMux *event.TypeMux
}
func NewTxPool(stateQuery StateQuery, eventMux *event.TypeMux) *TxPool {
return &TxPool{
pool: set.New(),
queueChan: make(chan *types.Transaction, txPoolQueueSize),
quit: make(chan bool),
stateQuery: stateQuery,
eventMux: eventMux,
}
}
func (pool *TxPool) addTransaction(tx *types.Transaction) {
pool.pool.Add(tx)
// Broadcast the transaction to the rest of the peers
pool.eventMux.Post(TxPreEvent{tx})
}
func (pool *TxPool) ValidateTransaction(tx *types.Transaction) error {
if len(tx.To()) != 0 && len(tx.To()) != 20 {
return fmt.Errorf("Invalid recipient. len = %d", len(tx.To()))
}
v, _, _ := tx.Curve()
if v > 28 || v < 27 {
return fmt.Errorf("tx.v != (28 || 27)")
}
// Get the sender
senderAddr := tx.From()
if senderAddr == nil {
return fmt.Errorf("invalid sender")
}
sender := pool.stateQuery.GetAccount(senderAddr)
totAmount := new(big.Int).Set(tx.Value())
// Make sure there's enough in the sender's account. Having insufficient
// funds won't invalidate this transaction but simple ignores it.
if sender.Balance().Cmp(totAmount) < 0 {
return fmt.Errorf("Insufficient amount in sender's (%x) account", tx.From())
}
return nil
}
func (self *TxPool) Add(tx *types.Transaction) error {
hash := tx.Hash()
if self.pool.Has(tx) {
return fmt.Errorf("Known transaction (%x)", hash[0:4])
}
err := self.ValidateTransaction(tx)
if err != nil {
return err
}
self.addTransaction(tx)
txplogger.Debugf("(t) %x => %x (%v) %x\n", tx.From()[:4], tx.To()[:4], tx.Value, tx.Hash())
// Notify the subscribers
go self.eventMux.Post(TxPreEvent{tx})
return nil
}
func (self *TxPool) Size() int {
return self.pool.Size()
}
func (self *TxPool) AddTransactions(txs []*types.Transaction) {
for _, tx := range txs {
if err := self.Add(tx); err != nil {
txplogger.Infoln(err)
} else {
txplogger.Infof("tx %x\n", tx.Hash()[0:4])
}
}
}
func (pool *TxPool) GetTransactions() []*types.Transaction {
txList := make([]*types.Transaction, pool.Size())
i := 0
pool.pool.Each(func(v interface{}) bool {
txList[i] = v.(*types.Transaction)
i++
return true
})
return txList
}
func (pool *TxPool) RemoveInvalid(query StateQuery) {
var removedTxs types.Transactions
pool.pool.Each(func(v interface{}) bool {
tx := v.(*types.Transaction)
sender := query.GetAccount(tx.From())
err := pool.ValidateTransaction(tx)
if err != nil || sender.Nonce >= tx.Nonce() {
removedTxs = append(removedTxs, tx)
}
return true
})
pool.RemoveSet(removedTxs)
}
func (self *TxPool) RemoveSet(txs types.Transactions) {
for _, tx := range txs {
self.pool.Remove(tx)
}
}
func (pool *TxPool) Flush() []*types.Transaction {
txList := pool.GetTransactions()
pool.pool.Clear()
return txList
}
func (pool *TxPool) Start() {
}
func (pool *TxPool) Stop() {
pool.Flush()
txplogger.Infoln("Stopped")
}
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